// HTML 支持的数学符号
function strNumDiscode(str) {
  str = str.replace(/&forall;/g, '∀')
  str = str.replace(/&part;/g, '∂')
  str = str.replace(/&exist;/g, '∃')
  str = str.replace(/&empty;/g, '∅')
  str = str.replace(/&nabla;/g, '∇')
  str = str.replace(/&isin;/g, '∈')
  str = str.replace(/&notin;/g, '∉')
  str = str.replace(/&ni;/g, '∋')
  str = str.replace(/&prod;/g, '∏')
  str = str.replace(/&sum;/g, '∑')
  str = str.replace(/&minus;/g, '−')
  str = str.replace(/&lowast;/g, '∗')
  str = str.replace(/&radic;/g, '√')
  str = str.replace(/&prop;/g, '∝')
  str = str.replace(/&infin;/g, '∞')
  str = str.replace(/&ang;/g, '∠')
  str = str.replace(/&and;/g, '∧')
  str = str.replace(/&or;/g, '∨')
  str = str.replace(/&cap;/g, '∩')
  str = str.replace(/&cup;/g, '∪')
  str = str.replace(/&int;/g, '∫')
  str = str.replace(/&there4;/g, '∴')
  str = str.replace(/&sim;/g, '∼')
  str = str.replace(/&cong;/g, '≅')
  str = str.replace(/&asymp;/g, '≈')
  str = str.replace(/&ne;/g, '≠')
  str = str.replace(/&le;/g, '≤')
  str = str.replace(/&ge;/g, '≥')
  str = str.replace(/&sub;/g, '⊂')
  str = str.replace(/&sup;/g, '⊃')
  str = str.replace(/&nsub;/g, '⊄')
  str = str.replace(/&sube;/g, '⊆')
  str = str.replace(/&supe;/g, '⊇')
  str = str.replace(/&oplus;/g, '⊕')
  str = str.replace(/&otimes;/g, '⊗')
  str = str.replace(/&perp;/g, '⊥')
  str = str.replace(/&sdot;/g, '⋅')
  return str
}

// HTML 支持的希腊字母
function strGreeceDiscode(str) {
  str = str.replace(/&Alpha;/g, 'Α')
  str = str.replace(/&Beta;/g, 'Β')
  str = str.replace(/&Gamma;/g, 'Γ')
  str = str.replace(/&Delta;/g, 'Δ')
  str = str.replace(/&Epsilon;/g, 'Ε')
  str = str.replace(/&Zeta;/g, 'Ζ')
  str = str.replace(/&Eta;/g, 'Η')
  str = str.replace(/&Theta;/g, 'Θ')
  str = str.replace(/&Iota;/g, 'Ι')
  str = str.replace(/&Kappa;/g, 'Κ')
  str = str.replace(/&Lambda;/g, 'Λ')
  str = str.replace(/&Mu;/g, 'Μ')
  str = str.replace(/&Nu;/g, 'Ν')
  str = str.replace(/&Xi;/g, 'Ν')
  str = str.replace(/&Omicron;/g, 'Ο')
  str = str.replace(/&Pi;/g, 'Π')
  str = str.replace(/&Rho;/g, 'Ρ')
  str = str.replace(/&Sigma;/g, 'Σ')
  str = str.replace(/&Tau;/g, 'Τ')
  str = str.replace(/&Upsilon;/g, 'Υ')
  str = str.replace(/&Phi;/g, 'Φ')
  str = str.replace(/&Chi;/g, 'Χ')
  str = str.replace(/&Psi;/g, 'Ψ')
  str = str.replace(/&Omega;/g, 'Ω')

  str = str.replace(/&alpha;/g, 'α')
  str = str.replace(/&beta;/g, 'β')
  str = str.replace(/&gamma;/g, 'γ')
  str = str.replace(/&delta;/g, 'δ')
  str = str.replace(/&epsilon;/g, 'ε')
  str = str.replace(/&zeta;/g, 'ζ')
  str = str.replace(/&eta;/g, 'η')
  str = str.replace(/&theta;/g, 'θ')
  str = str.replace(/&iota;/g, 'ι')
  str = str.replace(/&kappa;/g, 'κ')
  str = str.replace(/&lambda;/g, 'λ')
  str = str.replace(/&mu;/g, 'μ')
  str = str.replace(/&nu;/g, 'ν')
  str = str.replace(/&xi;/g, 'ξ')
  str = str.replace(/&omicron;/g, 'ο')
  str = str.replace(/&pi;/g, 'π')
  str = str.replace(/&rho;/g, 'ρ')
  str = str.replace(/&sigmaf;/g, 'ς')
  str = str.replace(/&sigma;/g, 'σ')
  str = str.replace(/&tau;/g, 'τ')
  str = str.replace(/&upsilon;/g, 'υ')
  str = str.replace(/&phi;/g, 'φ')
  str = str.replace(/&chi;/g, 'χ')
  str = str.replace(/&psi;/g, 'ψ')
  str = str.replace(/&omega;/g, 'ω')
  str = str.replace(/&thetasym;/g, 'ϑ')
  str = str.replace(/&upsih;/g, 'ϒ')
  str = str.replace(/&piv;/g, 'ϖ')
  str = str.replace(/&middot;/g, '·')
  return str
}

function strcharacterDiscode(str) {
  // 加入常用解析
  str = str.replace(/&nbsp;/g, ' ')
  str = str.replace(/&ensp;/g, ' ')
  str = str.replace(/&emsp;/g, '　')
  str = str.replace(/&quot;/g, "'")
  str = str.replace(/&amp;/g, '&')
  str = str.replace(/&lt;/g, '<')
  str = str.replace(/&gt;/g, '>')
  str = str.replace(/&#8226;/g, '•')

  return str
}

// HTML 支持的其他实体
function strOtherDiscode(str) {
  str = str.replace(/&OElig;/g, 'Œ')
  str = str.replace(/&oelig;/g, 'œ')
  str = str.replace(/&Scaron;/g, 'Š')
  str = str.replace(/&scaron;/g, 'š')
  str = str.replace(/&Yuml;/g, 'Ÿ')
  str = str.replace(/&fnof;/g, 'ƒ')
  str = str.replace(/&circ;/g, 'ˆ')
  str = str.replace(/&tilde;/g, '˜')
  str = str.replace(/&ensp;/g, '')
  str = str.replace(/&emsp;/g, '')
  str = str.replace(/&thinsp;/g, '')
  str = str.replace(/&zwnj;/g, '')
  str = str.replace(/&zwj;/g, '')
  str = str.replace(/&lrm;/g, '')
  str = str.replace(/&rlm;/g, '')
  str = str.replace(/&ndash;/g, '–')
  str = str.replace(/&mdash;/g, '—')
  str = str.replace(/&lsquo;/g, '‘')
  str = str.replace(/&rsquo;/g, '’')
  str = str.replace(/&sbquo;/g, '‚')
  str = str.replace(/&ldquo;/g, '“')
  str = str.replace(/&rdquo;/g, '”')
  str = str.replace(/&bdquo;/g, '„')
  str = str.replace(/&dagger;/g, '†')
  str = str.replace(/&Dagger;/g, '‡')
  str = str.replace(/&bull;/g, '•')
  str = str.replace(/&hellip;/g, '…')
  str = str.replace(/&permil;/g, '‰')
  str = str.replace(/&prime;/g, '′')
  str = str.replace(/&Prime;/g, '″')
  str = str.replace(/&lsaquo;/g, '‹')
  str = str.replace(/&rsaquo;/g, '›')
  str = str.replace(/&oline;/g, '‾')
  str = str.replace(/&euro;/g, '€')
  str = str.replace(/&trade;/g, '™')

  str = str.replace(/&larr;/g, '←')
  str = str.replace(/&uarr;/g, '↑')
  str = str.replace(/&rarr;/g, '→')
  str = str.replace(/&darr;/g, '↓')
  str = str.replace(/&harr;/g, '↔')
  str = str.replace(/&crarr;/g, '↵')
  str = str.replace(/&lceil;/g, '⌈')
  str = str.replace(/&rceil;/g, '⌉')

  str = str.replace(/&lfloor;/g, '⌊')
  str = str.replace(/&rfloor;/g, '⌋')
  str = str.replace(/&loz;/g, '◊')
  str = str.replace(/&spades;/g, '♠')
  str = str.replace(/&clubs;/g, '♣')
  str = str.replace(/&hearts;/g, '♥')

  str = str.replace(/&diams;/g, '♦')
  str = str.replace(/&#39;/g, "'")
  return str
}

function strDiscode(str) {
  str = strNumDiscode(str)
  str = strGreeceDiscode(str)
  str = strcharacterDiscode(str)
  str = strOtherDiscode(str)
  return str
}

function urlToHttpUrl(url, domain) {
  if (/^\/\//.test(url)) {
    return `https:${url}`
  } else if (/^\//.test(url)) {
    return `https://${domain}${url}`
  }
  return url
}

export default {
  strDiscode,
  urlToHttpUrl
}
